class_docstr: ExtType represents ext type in msgpack.
code: def __new__(cls, code, data):
      if not isinstance(code, int):
          raise TypeError("code must be int")
      if not isinstance(data, bytes):
          raise TypeError("data must be bytes")
      if not 0 <= code <= 127:
          raise ValueError("code must be 0~127")
      return super(ExtType, cls).__new__(cls, code, data)
  
file_path: catboost/contrib/python/pandas/py2/pandas/io/msgpack/__init__.py
imports: from collections import namedtuple
  from pandas.io.msgpack.exceptions import *
  from pandas.io.msgpack._version import version
  import os
  from pandas.io.msgpack._packer import Packer
  from pandas.io.msgpack._unpacker import unpack, unpackb, Unpacker
label_desc: Use image node_id 1 for calling the ExtType obj's underlying member method code with example usage: obj.__new__(cls, code, data) and returns: super